Absorption effect has empty heart containers, where it should have the poison/wither version of the hearts as seen bellow.
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Confirmed.

Is this still a concern in the current Minecraft version? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.
this problem is still in 1.6.2
Confirmed.
Here's a screenshot where its a bit more obvious.
*hearts
not harts

Is this still a concern in the latest Minecraft version 14w30c? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.
yeah, it's still in the game
Confirmed for 15w43b.
Confirmed for 15w43c.
Confirmed for 15w44a.
Confirmed for 15w46a
Is this still an issue in the latest snapshot 16w44a?
Confirmed for 1.12-pre2
Confirmed for 1.13.1.

Confirmed in 1.16.1.

Fixed resource pack attached.